webpack.config.js

var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
// var purify = require('purifycss-webpack-plugin');

module.exports = {
  entry: './src/main.js',
  output: {
    path: __dirname + '/public', //NOTE CHANGE
    filename: 'bundle.js'
  },
  module: {
    loaders: [
        {
          test: /\.scss$/,
          loader: ExtractTextPlugin.extract('css-loader!sass-loader') //NOTE CHANGE
        }
    ]
  },
  plugins: [
    new ExtractTextPlugin('./css/bootstrap.css'),
  ]
}